glTF exporter: fix parenting check

When bone parent is still set, but user moved to "OBJECT" parent type, without resetting bone parent

io_scene_gltf2/__init__.py

@@ -4,7 +4,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (3, 5, 20),
+    "version": (3, 5, 21),
     'blender': (3, 4, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',

io_scene_gltf2/blender/exp/gltf2_blender_gather_tree.py

@@ -239,7 +239,7 @@ class VExportTree:
 
         # Object parented to bone
         if blender_bone is not None:
-            for child_object in [c for c in blender_children[blender_object] if c.parent_bone is not None and c.parent_bone == blender_bone.name]:
+            for child_object in [c for c in blender_children[blender_object] if c.parent_type == "BONE" and c.parent_bone is not None and c.parent_bone == blender_bone.name]:
                 self.recursive_node_traverse(child_object, None, node.uuid, parent_coll_matrix_world, blender_children)
 
         # Duplis